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The size argument for APS-C / m43 is kinda true, kinda not. FF absolutely does have larger cameras and lenses, but they also have lots of smaller options too.
If you care about aperture equivalence, then FF probably has the most compact options. If you don't care about aperture equivalence, and only want the smallest, m43 and APS-C have good options, especially on the tele end with m43.
Here's an example of some common prime focal lengths, and a midrange zoom.
>this ignores weather sealing, autofocus speed and optical quality
>there are smaller body options for m43/aps-c
>tried to get the closest lens for each, but some are definitely not equivalent
>these are prioritizing size over quality (fuji 35 f1.4 vs 33 f1.4 for example)
